Polyolefin Film Printing With EB Curing for Register Accuracy
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Solution Overview
Problem
The use of flexible plastic films in packaging materials leads to misalignment and insufficient register accuracy due to ink cohesion, while harder films increase the likelihood of bag breakage.
Innovation Solution
A method involving transferring an ink onto a polyolefin film with a tensile modulus of 200 MPa to 1,000 MPa in the MD direction using a central impression printing method, followed by electron beam curing, with specific conditions for crystallinity and irradiation parameters to enhance register accuracy and prevent bag breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible plastic film is used for packaging materials, then the flexibility and flexibility of the packaging bag is improved, but the register accuracy deteriorates due to ink cohesion causing misalignment
Solution Approach 1:
The patent changes the physical parameters of the polyolefin film by controlling its tensile modulus to be within 200-1000 MPa in the machine direction. This parameter optimization allows the film to maintain flexibility while providing sufficient tension to prevent ink cohesion and misalignment, thereby resolving the contradiction between flexibility and register accuracy.
2Manufacturing precision
If a harder film is selected to improve register accuracy, then the register accuracy is improved, but the packaging bag becomes more likely to be broken
Solution Approach 1:
The patent optimizes the tensile modulus parameter of the polyolefin film to fall within the specific range of 200-1000 MPa. This controlled parameter selection provides just the right amount of hardness to ensure register accuracy during printing, while avoiding excessive hardness that would make the packaging bag prone to breakage, thus resolving the contradiction between register accuracy and bag strength.
3Reliability
If electron beam irradiation is applied to cure the ink, then the adhesion and curing speed are improved, but the crystallinity of the polyolefin film changes which may affect film properties
Solution Approach 1:
The patent controls the electron beam irradiation parameters (acceleration voltage and irradiation dose) to achieve proper ink curing while minimizing unwanted changes in the polyolefin film's crystallinity. By optimizing these parameters, the patent maintains film stability and prevents excessive crystallinity changes that would adversely affect film properties, thus resolving the contradiction between adhesion improvement and crystallinity stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method produces a printed matter with excellent register accuracy and inhibits packaging bag breakage, even with flexible films, by optimizing film tension and crystallinity changes through electron beam curing.
Implementation Method 1
the curing step of irradiating the ink with an electron beam to cure the ink
Implementation Method 2
active energy ray-curable printing inks that can be instantly cured by irradiation with an active energy ray, such as an electron beam or a UV ray
Implementation Method 3
a ratio (C2/C1) of a crystallinity C2 of the polyolefin film after electron beam irradiation performed under the conditions of an acceleration voltage of 110 KV and an irradiation dose of 40 kGy with respect to a crystallinity C1 of the polyolefin film
Implementation Method 4
the crystallinity C2 of the polyolefin film after electron beam irradiation
Data Source
AI summary
Provided is a method of producing a printed matter, the method including, in the order mentioned: the transfer step of transferring an ink onto a polyolefin film having a tensile modulus of 200 MPa to 1,000 MPa in an MD direction by a central impression printing method; and the curing step of irradiating the ink with an electron beam to cure the ink. This method of producing a printed matter can yield a printed matter that has excellent register accuracy and can inhibit the breakage of a packaging bag, even with the use of a flexible film such as a polyolefin film.